ADWA AD331 Professional Conductivity(EC)-Temperature Portable Meter with GLP


Auto-Ranging feature that sets the instrument to the scale with the highest resolution; Built in memory and GLP (Good Laboratory Practice)

  • Parameters: EC(Conductivity), Temperature


AD331 is a waterproof portable meter that reads Conductivity in 5 ranges and temperature. The auto ranging feature of the EC range automatically sets the instrument to the scale with the highest resolution. Measurements are compensated for temperature effect automatically (ATC) or manually (MTC). It is also possible to disable the temperature compensation feature to measure the actual conductivity. The temperature coefficient is user selectable. This instrument also features a measurement stability indicator, GLP capability, and a user selectable ID code to uniquely identify the instrument.

EC Specifications

EC range

0.00 to 19.99 μS/cm | 20.0 to 199.9 μS/cm | 200 to 1999 μS/cm | 2.00 to 19.99 mS/cm | 20.0 to 199.9 mS/cm

EC Resolution

0.01 μS/cm | 0.1 μS/cm | 1 μS/cm | 0.01 mS/cm | 0.1 mS/cm

EC Accuracy (@25ºC/77ºF)

±1% f.s.

EC Calibration

Offset 0.0 μS/cm; Slope: 1 point with 6 memorized standards (84.0, 1413 μS/cm; 5.00,12.88, 80.0, 111.8 mS/cm) or one custom value

Temperature Compensation

ATC/MTC, -9.9 to 120.0°C

Temperature Specifications

Temperature Range

-9.9 to 120.0°C

Temperature Resolution


Temperature Accuracy


Additional Specifications


AD76309 - Stainless steel, 4-ring EC/TDS/Temperature probe with DIN connector and 1 m cable


Yes (With time stamp)


Log-on-demand: Up to 250 samples

Hold Function


Low Battery Indication


Auto Shutt-off

User selectable: 5 minutes or disabled

Battery Type / Life

4 x 1.5V AA batteries / Approx. 200 hours of continuous use


188 x 96 x 70 mm


460 g

Ordering Information

Adwa AD331 is supplied with AD76309 - Conductivity probe with built-in temperature sensor; AD70031 - 1413 μS/cm calibration solutions in sachet (20 ml); AD70030 - 12.88 mS/cm calibration solutions in sachet (20 ml); Wrist strap; Batteries (4 x 1.5V, AA alkaline); Instruction manual


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